Revert "Add a Color class to dart:sky."

sky/engine/core/painting/CanvasColor.cpp

Index: sky/engine/core/painting/CanvasColor.cpp
diff --git a/sky/engine/core/painting/CanvasColor.cpp b/sky/engine/core/painting/CanvasColor.cpp
deleted file mode 100644
index 9788da811c8b85efcc6dbc684970bfb19fa6deac..0000000000000000000000000000000000000000
--- a/sky/engine/core/painting/CanvasColor.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "sky/engine/config.h"
-#include "sky/engine/core/painting/CanvasColor.h"
-
-#include "sky/engine/core/script/dom_dart_state.h"
-#include "sky/engine/tonic/dart_builtin.h"
-#include "sky/engine/tonic/dart_error.h"
-#include "sky/engine/tonic/dart_value.h"
-
-namespace blink {
-
-// Convert dart_color => SkColor.
-CanvasColor DartConverter<CanvasColor, void>::FromArgumentsWithNullCheck(
-    Dart_NativeArguments args,
-    int index,
-    Dart_Handle& exception) {
-  CanvasColor result;
-
-  Dart_Handle dart_color = Dart_GetNativeArgument(args, index);
-  DCHECK(!LogIfError(dart_color));
-
-  Dart_Handle value =
-      Dart_GetField(dart_color, DOMDartState::Current()->value_handle());
-
-  uint64_t color = 0;
-  Dart_Handle rv = Dart_IntegerToUint64(value, &color);
-  DCHECK(!LogIfError(rv));
-  DCHECK(color <= 0xffffffff);
-
-  result.sk_color = static_cast<SkColor>(color);
-  return result;
-}
-
-void DartConverter<CanvasColor, void>::SetReturnValue(
-    Dart_NativeArguments args, unsigned val) {
-  Dart_Handle color_class = DOMDartState::Current()->color_class();
-  Dart_Handle constructor_args[] = { ToDart(val) };
-  Dart_SetReturnValue(args,
-                      Dart_New(color_class, Dart_Null(), 1, constructor_args));
-}
-
-} // namespace blink